| 摘要 |
PROBLEM TO BE SOLVED: To provide a nitrogen oxides sensor in which the sensitivity of NO and the sensitivity of NO2 can be controlled arbitrarily, in which the concentration of NO and the concentration of NO2 can be detected independently even in an atmosphere with coexistent NO and NO2 and whose heat resistance is excellent. SOLUTION: A nitrogen oxides sensor is constituted of a sensor element composed of an oxide ion conductive solid electrolyte 1 in which two electrodes 2, 3 forming a pair are formed on its surface and of a voltage source or a current source 8 which can apply a voltage of a current across the two electrodes forming the pair. At least one electrode out of the two electrodes 2, 3 is formed of an oxide containg at least a metal (however, excluding a noble metal) belonging to any of the VI group, the VII group and the VIII group in the periodic table of elements. At least one component out of nitrogen oxides in a gas to be detected is detected on the basis of a current flowing at a time when the voltage is applied across the electrodes or on the basis of a voltage across the electrodes at the time when the current is applied. |
